(19)

(11)

EP 0 857 237 A1

(12)

(43) Date of publication: 12.08.1998 Bulletin 1998/33 (21) Application number: 96930558.0 (22) Date of filing: 21.08.1996

(51) International Patent Classification (IPC):  E01F 9/ 011( . ) E01F 13/ 12( . ) E01F 13/ 04( . ) (86) International application number: PCT/US1996/013495 (87) International publication number: WO 1997/015729 (01.05.1997 Gazette 1997/19)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 27.10.1995 US 19950549510 27.10.1995 US 19950549508 (71) Applicant: The Entwistle Company Hudson, MA 01749 (US)	(72) Inventors: JACKSON, Martin, A. Hudson, MA 01749 (US) GORHAM, Gerald, L. Hudson, MA 01749 (US) RHATIGAN, John, M. Hudson, MA 01749 (US) (74) Representative: Casey, Lindsay Joseph, et al  F. R. Kelly & Co. 27 Clyde Road Ballsbridge Dublin 4 Dublin 4 (IE)